Brush Excitation
TECO-Westinghouse synchronous motor are also available with brush rigging and collector rings. The complete assembly is designed for long life and is easily accessible for inspection and routine maintenance. Made of steel or other suitable materials, the collector rings are shrunk onto a steel mandrel over a Micarta insulation sleeve. The assembly is held in place on the motor shaft by a tight press fit. To ensure permanent concentricity, collector ring surfaces are machine finished and polished after assembly on the rotor shaft. The brush rigging consists of cast-brass brushholders mounted on insulated steel rods, which are supported from the bearing pedestal. The number of brushes for a particular sized and rating depends on the field current, and sufficient brushes are supplied to limit the current density to a low value for trouble-free operation. Brushes are of the electrographitic type and are specially selected for each application. |
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